Allusion

an expression that calls to mind an idea outside of the work itself.  Most effective when the reader has a reference for what is being alluded to because it adds meaning to the work without further explanation from the writer.  Look for it here:

Prometheus by Lord Byron

Ethereal by S.M.(M).L.

These mortal cages hold us in but a little while. 
Locked with blood and bone, we knock around,
bump into each other to let a little bit out, 
a little bit in, a way to save our selves--
reincarnate incarceration.  As if we have found
the key, we behave, lending this unto the next,
never stopping to peer through the hole
to see what's on the other side.  Out there, space,
star after star, beyond until these ribs
are nothingness holding us together.  So far 
out there, there's no coming back except 
that we've chained our hearts in inescapable love.

It seems. Except. That's all there was all along.
Love in and out, around, folded over on itself,
infinite, not a chain, but a link, not a cage, 
but a scaffold to lift ourselves back to whence
we came if only we can let go these bounds
desirous of Prometheus that seem to hold
us in but merely let us perceive the impossibility
of existence for a breath of time, in, out, exist,
out        in        love        breathe        be